JPH07315644A - Sheet body winding device - Google Patents

Abstract

PURPOSE:To carry out continuous winding of a sheet body smoothly and surely by bringing the vicinity of a terminal of a sheet body which is wound from a first sheet body roller into pressure-contact from a position which is apart at a specific angle around a shaft of a second sheet body roller to a joint part. CONSTITUTION:Pressure-contact of a first sheet body 9 with a second sheet body roller 8 by a joint roller 25 is started when a joint part 21 is at a position which is apart at an angle of 180 deg. around a support shaft 7 for the joint roller 25 and is carried out until the joint part 21 moves to a position which corresponds to the joint roller 25. Accordingly, even if an error occurs in a time interval from the time when turn of a turning arm 29 is started to the time when the joint roller 25 reaches a position where the first sheet body 9 is brought into pressure-contact with the second sheet body roller 8 and the position of the joint part 21 at the start of this pressure-contact is deviated forward and backward as shown by the arrow Q, such an accident that pressure- contact is started on the joint part 21 does not occur because a distance up to the joint roller 25 is sufficiently long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet body unwinding device for continuously unwinding a sheet body from a plurality of sheet body rolls in a magnetic tape manufacturing process.

[0002]

2. Description of the Related Art Conventionally, in the process of manufacturing a magnetic tape, a sheet body (web) serving as a base film (nonmagnetic support) of the magnetic tape is wound around a sheet body roll. A sheet body unwinding device for sending to a next step such as a magnetic material coating step or a cutting step is used.

As the sheet body unwinding device, when the first sheet body unwound from the first sheet body roll (old roll) approaches the end, the vicinity of the end of the first sheet body A device that makes it possible to continuously unwind a plurality of sheet bodies by joining the starting end portion of the second sheet body wound around the second sheet body roll (new roll) Proposed.

In such a sheet body unwinding device, the second sheet body roll is provided with a joining portion to which a pressure sensitive adhesive or the like is adhered at the starting end portion of the second sheet body on the outer peripheral surface. It is rotated and operated. The rotation speed of the second sheet body roll is controlled so that the peripheral speed becomes equal to the speed of the first sheet body unwound and conveyed from the first sheet body roll. Then, the vicinity of the terminal end of the first sheet body is pressure-welded to the joint portion on the outer peripheral surface of the second sheet body roll, and is joined to the starting end portion of the second sheet body. Such pressure contact of the first sheet body to the second sheet body is performed by a joining roll capable of being brought into contact with and separated from the second sheet roll. The second sheet body is unrolled following the vicinity of the end portion of the first sheet body. At this time, the first sheet body is cut behind the portion joined to the second sheet body.

The end portion of the second sheet body is, like the end portion of the first sheet body, the end portion of the third sheet body wound as a third sheet body roll (new roll). It is joined near the starting end. In this way, the next sheet body is sequentially joined and unwound, and the continuous sheet body is unwound.

[0006]

In the sheet body unwinding device as described above, the pressure contact of the first sheet body with the second sheet body by the joining roll corresponds to the joining roll. It is performed before the starting end of the second sheet body passes through the position. Then, the joining is completed when the starting end portion of the second sheet body passes through the position corresponding to the joining roll.

After the pressure contact of the first sheet body with the sheet body roll of the body 2 by the joining roll is started, the starting end portion of the second sheet body passes through the position corresponding to the joining roll. The distance over which the first sheet body is conveyed is called the margin length. This margin length is
It is set to a fixed distance.

If the margin length is constant, the second
The angular position of the starting end of the second sheet body relative to the pressure welding start position of the joining roll varies depending on the circumference of the sheet body roll (new roll).

When the margin length and the peripheral length of the second sheet roll are equal, for example, when both are 1 m, the joining roll is the first roll.
The pressure contact is started at the starting end portion of the second sheet through the sheet body. In this case, due to the impact of the pressure contact by the joining roll and a subtle difference in the speed of each sheet body, the second sheet body may be rolled up at the starting edge portion or may not be joined to the first sheet body. There is a risk that it will be perfect. Then, the starting end portion of the second sheet body is peeled off from the first sheet body, and continuous unwinding cannot be performed.

Further, in the above-mentioned sheet body unwinding device, if the peripheral speed of the second sheet body roll is not accurately synchronized with the conveying speed of the first sheet body,
It is not possible to reliably join the starting end portion of the second sheet body to the first sheet body. Therefore, in this sheet body unwinding device, it is necessary to accurately detect the peripheral speed of the second sheet body roll.

The peripheral speed of the second sheet body roll is determined by a contact sensor for detecting the contact with the outer peripheral surface of the second sheet body roll and a position sensor for detecting the position of the sensor arm supporting the sensor. It is possible to detect the radius of the second sheet roll by a detection device having, and calculate and obtain from this radius and the rotational angular velocity of the second sheet roll.

However, when such a detecting device is used, the error due to the displacement of the sensor arm or the like is large, and there is a possibility that the accurate peripheral speed of the second sheet roll cannot be obtained. . In addition, bringing the contact sensor into contact with the outer peripheral surface of the second sheet body roll is performed in the second
The sheet body may be damaged or disturbed in physical properties.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and is the second aspect of the sheet body being conveyed.
The pressure welding by the joining roll to the sheet body roll of
Of the sheet body forming the second sheet body roll by surely avoiding the starting end portion of the sheet body forming the second sheet body roll and accurately detecting the peripheral speed of the second sheet body roll. It is an object of the present invention to provide a sheet body unwinding device that can be surely joined to a roll and that can smoothly unwind these sheet bodies continuously.

[0014]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, a sheet body unwinding device according to the present invention comprises a first rotation operation means for rotating a first sheet body roll. , Through the first rotation operation means, the first
First speed control means for controlling the rotation speed of the sheet body roll and controlling the conveying speed of the sheet body unwound from the first sheet body roll, and the second speed control means for rotating the second sheet body roll. Rotation operation means, speed detection means for detecting the peripheral speed of the second sheet body roll, and control of the second rotation operation means to detect the second sheet body roll of the second sheet body roll. Second speed control means for synchronizing the peripheral speed with the conveying speed of the sheet body unwound from the first sheet roll, and a joint provided on the peripheral surface of the second sheet roll are detected. And a sheet member unwound from the first sheet body roll, which is rotatably supported and can be moved in a contacting / separating direction with respect to the second sheet body roll. Seat body of A bonding roll that is brought into pressure contact with the peripheral surface of the bonding roll, and a control unit that controls a moving operation with respect to the bonding roll. By controlling the movement operation, the vicinity of the terminal end of the sheet body unwound from the first sheet body roll is on the peripheral surface of the second sheet body roll, and the second sheet with respect to the joint portion. The pressure is applied from a position separated by 180 ° around the axis of the body roll to the joint portion.

Further, according to the present invention, in the above-mentioned sheet body unwinding device, the means for detecting the peripheral speed of the second sheet body roll is a non-contact speed sensor.

[0016]

In the sheet body unwinding device according to the present invention, the sheet body unwinding device is rotated in synchronization with the conveying speed of the sheet body unwound from the first sheet body roll in the direction in which the second sheet body roll is moved. The control means for controlling the moving operation of the joining roll detects the speed detecting means for detecting the peripheral speed of the second sheet roll and the joining portion provided on the peripheral surface of the second sheet roll. Based on the detection result by the joint portion detection means, the vicinity of the end of the sheet body unwound from the first sheet body roll is provided to the joint portion on the peripheral surface of the second sheet body roll. Since the second sheet body roll is pressed against the axis from a position separated by 180 ° to the joint portion, it is most effective even when the outer diameter of the second sheet body roll is different. Secure margin length, To reliably bond the unwound sheet and the second sheet body roll than sheet roll.

Further, in the above-mentioned sheet body unwinding apparatus, when the means for detecting the peripheral speed of the second sheet body roll is a non-contact speed sensor, the second sheet body roll is damaged and damaged. It is possible to accurately detect the peripheral speed of the second sheet body roll without the risk of giving the sheet member, and to ensure the sheet body unwound from the first sheet body roll and the second sheet body roll. To join.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a sheet body unwinding device according to the present invention includes a turret arm 4 rotatably supported via a turret shaft 3 on the upper end side of a column 2 standing on a base 1. have.

A first sheet roll 6 is rotatably supported on one end of the turret arm 4 via a first support shaft 5 that is vertically provided on the turret arm 4. A second sheet roll 8 is rotatably supported on the other end of the turret arm 4 via a second support shaft 7 parallel to the first support shaft 5. The turret arm 4 can be intermittently rotated at angular positions of 180 °.

The sheet body forming each of the sheet body rolls 6 and 8 is a sheet body made of a synthetic resin material which serves as a tape base of a magnetic tape, and is wound out from the sheet body rolls 6 and 8 to form a magnetic material. It is conveyed to the next step such as the coating step and the cutting step.

The first sheet body roll 6 is provided with the second sheet roll.
The sheet roll 8 is a new roll that has not been used, whereas the second roll is an old roll that is unwound before the second roll 8. That is, the first sheet body 9 forming the first sheet body roll is unrolled and conveyed to the next process before the second sheet body 10 forming the second sheet body roll 8. It is something.

The first sheet roll 6 is wound in a direction in which the first sheet body 9 is unwound as indicated by an arrow A in FIG. 1 by a first rotation driving device (not shown) serving as a first rotation operation means. It is rotated. The first rotary drive device,
The rotational angular velocity of the first sheet roll 6 is controlled by the first velocity control device serving as the first velocity control means so that the transport speed of the unwound first sheet body 9 becomes constant. Control.

The first sheet body 9 is guided by a plurality of guide rollers 11, 12 and 13 to form a dancer roll 1.
4 and then guided by the guide roller 15,
As indicated by arrow C in FIG. 1, the sheet is conveyed to the next step.
The dancer roll 14 is rotatably attached to the tip end side of a dancer arm 17 which is rotatably supported on the base end side by a support shaft 16, and as shown by an arrow B in FIG. , 15 is movable in the contacting / separating direction. The dancer roll 14 is elastically moved with respect to the neutral position.

The sheet member extending between the guide rollers 13 and 15 is wound around the dancer roll 14, and the dancer roll elastically moves in the contact and separation directions with respect to the guide rollers 13 and 15 to be described later. The shock and the change in speed at the time of joining the sheet bodies together are buffered.

Then, the second sheet body roll 8 is
By the second rotation driving device (not shown) serving as the second rotation operation means, as shown by an arrow D in FIG. 1, the second sheet is in the same direction as the rotation direction of the first sheet roll 6. The body 10 is rotated in the unwinding direction.

The second rotational drive device is controlled by a second speed control device serving as a second speed control means, and the peripheral speed of the second sheet roll 8 is the first sheet body 9. The rotational angular velocity of the second sheet roll 8 is controlled so as to be synchronized with the conveyance speed of.

The peripheral speed of the second sheet body roll 8 is the diameter P of the second sheet body roll 8 detected by the roll diameter measuring sensor 18 serving as a speed detecting means, and the second sheet body roll. It is calculated from the rotational angular velocity of the second support shaft 7 supporting the shaft 8. The roll diameter measuring sensor 18 is
1 is a contact sensor, and the sensor arm 33
As indicated by the middle arrow E, the second support shaft 7 is supported so as to be movable in the contacting / separating direction with respect to the second support shaft 7. The roll diameter measuring sensor 18 can detect a distance from the second support shaft 7 by a rotary encoder 19 via a gear portion 20 provided on the sensor arm 33. That is, the roll diameter measuring sensor 18 is the second
The distance from the second support shaft 7 of the roll diameter measuring sensor 18 when in contact with the outer peripheral surface of the second sheet body roll 8 is the radius (P / 2) of the second sheet body roll 8. is there. That is, the signal indicating the output of the rotary encoder 19 and the rotational angular velocity of the second sheet roll 8 by the second rotation drive device is a signal indicating the peripheral velocity of the second sheet roll 8, It is sent to the control device that serves as control means.

At the starting end portion of the second sheet body 10 on the outer peripheral surface of the second sheet body roll 8, the joint portion 2 is formed.
1 is provided. The joint portion 21 is formed of an adhesive or the like, and is provided so as to face the outer side of the second sheet body roll 8.

A joint portion sensor 22 serving as a joint portion detecting means is disposed near the second sheet roll 8. The joint sensor 22 is configured to output a detection signal when the joint 21 passes to a position facing the joint sensor 22. The detection output of the joint sensor 22 is sent to the control device.

In the vicinity of the second sheet body roll 8, a joint roller is provided so as to cooperate with the second sheet body roll 8 to sandwich the conveyance path of the first sheet body 9. 25 are provided. This joining roll 25 is
Rotating arm 2 rotatably supported on the support shaft 23 at the base end side
It is rotatably arranged on the upper surface 9. This rotating arm 29
Has a joint portion 24 in a portion between the support shaft 23 and the joining roll 25. An air cylinder 28 is interposed between the base end portion of the rotating arm 29 and the tip end side of the joint portion 24.

The joining roll 25 is composed of the rotating arm 2
As shown by an arrow F in FIG. 1, when 9 is rotated toward the second sheet body roll 8 side, it is moved to a position close to the outer peripheral surface of the second sheet body roll 8. . The distance between the joining roll 25 and the second sheet roll 8 at this time is controlled to be constant by an optical sensor (not shown). And this joining roll 25
Is further moved to the side of the second sheet body roll 8 by the air cylinder 28 as shown by an arrow H in FIG. 1, and cooperates with the second sheet body roll 8 to form the first sheet. The body 9 is clamped, and the first sheet body 9 is brought into pressure contact with the second sheet body roll 8.

A cutter 27 is disposed via a support shaft 26 at a position between the joining roll 25 and the first sheet roll 6 on the tip end side of the rotating arm 29. There is. When the joining roll 25 presses the first sheet body 9 against the second sheet body roll 8 as shown by an arrow G in FIG.
The first sheet body 9 is moved to the sheet body 9 side of the
Is cut at a portion between the joining roll 25 and the first sheet body roll 6.

In the sheet body unwinding device constructed as described above, the conveyance of the first sheet body 9 to the next step progresses to advance the first sheet body in the first sheet body roll 6. When the remaining amount of 9 is reduced, the end side portion of the first sheet body 9 is joined to the start end portion of the second sheet body 10.

That is, when the remaining amount of the first sheet body 9 in the first sheet body roll 6 becomes less than a predetermined amount, the joining roll 25 causes the rotation arm 29 to rotate and the air cylinder 28 to move. By the operation, the first sheet body 9 is brought into pressure contact with the outer peripheral surface portion of the second sheet body roll 8. The first sheet body 9 pressed against the outer peripheral surface of the second sheet body roll 8 is joined to the joint portion 21, and the start end portion of the second sheet body 10 provided with the joint portion 21. At the same time, the transportation is continued. And
The first sheet body 9 is cut by the cutter 27 on the rear side of the joint portion to the joint portion 21. In this way, to the next step, continuous conveyance is performed in a state where the end side portion of the first sheet body 9 and the start side portion of the second sheet body 10 are joined.

After that, the second sheet roll 8 is
When the turret arm 4 is rotated by 180 °, the turret arm 4 is moved to the position where the first sheet roll 6 was located together with the second support shaft 7. Then, instead of the first sheet body roll 6, a third sheet body roll is mounted on the first support shaft 5. When the unwinding of the second sheet body 10 from the second sheet body roll 8 is completed, the third sheet body roll is provided with a third sheet body on the terminal end side of the second sheet body 10. This is a new roll that joins the starting ends of the sheets.

In the sheet body unwinding device, the first sheet body 9 formed by the joining roll 25 is used.
2 is pressed against the second sheet roll 8 at a position where the joint portion 21 is separated from the joint roll 25 by an angle of 180 ° around the second support shaft 7, as shown in FIG. Is started at the time of 1), and is performed until the joining portion 21 is moved to the position corresponding to the joining roll 25.

Therefore, in this sheet body unwinding device, the joining roll 25 causes the first sheet body 9 to move to the second state after the rotation of the rotation arm 29 is started.
An error occurs in the time t until reaching the position where the sheet body roll 8 is brought into pressure contact, and the position of the joint portion 21 at the start of this pressure contact is displaced back and forth as indicated by an arrow Q in FIG. Even if it occurs, since the distance to the joining roll 25 is sufficiently long, the accident that the pressure welding is started on the joining portion 21 does not occur.

That is, in this sheet body unwinding device, the control device controls the conveying speed of the first sheet body 9, that is, the peripheral speed of the second sheet body roll 8 and the joint portion sensor 22. The timing of movement of the joining roll 25 is controlled in accordance with the timing of detection of the joining portion 21 by.

For example, the sheet conveying speed is set to 300.
[M / min] (5000 [mm / sec] = V), and the diameter P of the second sheet roll 8 is 640 mm.
If the angle (angle (L + M + N) in FIG. 1) between the point K, which is the starting position of the pressure welding by the joining roll 25, and the point J, which is the opposite position of the joining sensor 22, is 225 °, then 640 × π × (225/360) ÷ (300000/6
0) = 0.251 (sec) = 251 [ms], 251 ms is the time from when the joint sensor 22 detects the joint 21 to when the joint 21 reaches the point K.

Since the welding by the joining roll 25 is started when the joining portion 21 is at the position of 180 ° with respect to the point K, the margin length corresponding to the 180 ° is early. The crimping must be started. The diameter of the second sheet body roll 8 is 640
When it is mm, the margin length is 640 × π / 2≈1000 [mm], and when the time corresponding to this margin length is subtracted, 0.251− (1000 / (300000/60)) =
0.051 = 51 [ms]. However, after the rotation of the rotation arm 29 is started, the joining roll 25 is moved to the first sheet body 9
Assuming that the time t to reach the position where the sheet is pressed against the second sheet roll 8 is 25 ms, this time t is as shown in FIG.
Corresponding to the inside angle M, when converted to the distance on the second sheet body roll 8, it becomes 0.025 × (300000/60) = 125 [mm]. This time t is also subtracted, and 51-25 = 26 [ms] becomes time T from when the joint sensor 22 detects the joint 21 to when the pivot arm 29 starts to pivot. . This 26 ms is 0.026 × (300000/60) = 130 [mm] when converted into the distance on the second sheet roll 8, which corresponds to the angle L in FIG.

Summarizing the above equations, the time T from the detection of the joint 21 by the joint sensor 22 to the start of the rotation of the rotating arm 29 is T = bea Pπ (L + M ) / 360V Bo-t, and if the angles L, M [°], the diameter P [mm], the transport speed V [mm / sec], and the time t [sec] are known, it can be determined.

Therefore, in this sheet body unwinding device, as shown in FIG. 3, even when the diameter P of the second sheet body roll 8 is different, the time T is variable according to the above equation. Since it is controlled, at the start of the pressure contact of the first sheet body 9 with the second sheet body roll 8 by the joining roll 25, the joining portion 21 is
18 around the second support shaft 7 with respect to the joining roll 25
It is done so that they are separated by 0 °.

The impact at the start of the pressure welding by the joining roll 25 is buffered by the elastic movement of the dancer roll 14.

As shown in FIGS. 4 to 7, the sheet body unwinding device according to the present invention uses a non-contact speed sensor 31 as the speed detecting means and a sequencer 30 as the control circuit. You may comprise.

The non-contact speed sensor 31 is supported by a sensor arm 33, and can be moved in the contacting / separating direction with respect to the outer peripheral surface of the second sheet roll 8. Since the non-contact speed sensor 31 is close to the outer peripheral surface of the second sheet roll 8, the non-contact speed sensor 31 can directly detect the peripheral speed of the outer peripheral surface without contacting the outer peripheral surface. It is configured.

A laser displacement meter 32 is arranged near the non-contact speed sensor 31 on the sensor arm 33. The laser displacement meter 32 includes the sensor arm 33.
Is controlled to position the non-contact speed sensor 31 at a position where the peripheral speed of the second sheet roll 8 can be detected.

The sequencer 30 controls the first rotary drive device as shown in FIG. 4 when the first sheet body 9 is unwound from the first sheet body roll 6. Then, the rotation speed of the first sheet body roll 6 is controlled as indicated by an arrow A in FIG. 4 so that the conveyance speed of the first sheet body 9 becomes constant.

Then, the sequencer 30 uses the first sequencer
When the unwinding of the sheet body 9 is advanced and the remaining amount of the first sheet body 9 in the first sheet body roll 6 becomes a predetermined amount or less, as shown in FIG. Data of the peripheral speed of the second sheet roll 8 is taken in, and arrow D in FIG. 5 is set so that the peripheral speed of the second sheet roll 8 and the transport speed of the first sheet body 9 are synchronized. As shown in, the second rotary drive device is controlled.

When the peripheral speed of the second sheet body roll 8 and the conveying speed of the first sheet body 9 are synchronized, the sequencer 30 causes the joining roll 25 to move, as shown in FIG.
Also, the cutter 27 is controlled to move. That is, the sequencer 30 causes the joining roll 25 to join the first sheet body 9 to the joining portion 2 on the second sheet body roll 8.
After being pressed and bonded to 1, the cutter 27 is used to
The first sheet body 9 is cut on the rear side of the joint portion with respect to the joint portion 21.

As described above, when the sequencer 30 moves the joining roll 25 to the second sheet roll 8 side, the joining portion 21 is moved to the joining roll 25 as described above. 180 around the second spindle 7
It is located at a position separated by °.

In this sheet body unwinding device having the non-contact speed sensor 31, the peripheral speed of the second sheet body roll 8 can be accurately detected, so that the sequencer 30 operates the joining roll 25. The position of the joining portion 21 when moved to the side of the second sheet roll 8 may be a position sufficiently separated from the joining roller 25, and is 180 ° around the second supporting shaft 7. Is not limited to the positions separated by.

When the cutting of the first sheet body 9 by the cutter 27 is completed, as shown in FIG. 7, the second sheet body 10 has the starting end portion at the joining portion 21.
The sheet is unwound by following the end portion of the first sheet body 9 via the, and conveyed to the next step. At this time, the sequencer 30 performs the same control on the second rotary drive device as the control on the first rotary drive device when the first sheet body 9 is being conveyed. That is,
The sequencer 30 controls the rotation speed of the second sheet roll 8 as indicated by an arrow D in FIG. 7 so that the second sheet 10 is conveyed at a constant speed.

[0053]

As described above, in the sheet body unwinding device according to the present invention, the second sheet which is rotationally operated in synchronization with the conveying speed of the sheet body unwound from the first sheet body roll. The control means for controlling the movement operation of the joining roll in the approaching / separating direction with respect to the body roll is provided on the peripheral surface of the second sheet body roll and the speed detecting means for detecting the peripheral speed of the second sheet body roll. Based on the detection result by the joint portion detecting means for detecting the formed joint portion, the vicinity of the end of the sheet body unwound from the first sheet body roll is on the peripheral surface of the second sheet body roll. The joint portion is pressed against the joint portion from a position separated by 180 ° around the axis of the second sheet roll to reach the joint portion.

Therefore, in this sheet body unwinding device, even if the outer diameter of the second sheet body roll is different, the most effective margin length can be secured, and the first sheet body can be secured. The sheet member unwound from the roll and the second sheet member roll can always be reliably joined.

Further, in the above-mentioned sheet body unwinding device, when the means for detecting the peripheral speed of the second sheet body roll is a non-contact speed sensor, the second sheet body roll is damaged. It is possible to accurately detect the peripheral speed of the second sheet body roll without any fear of giving the sheet body, and the sheet body unwound from the first sheet body roll and the second sheet body roll. Can be reliably joined.

That is, according to the present invention, the pressing of the conveyed sheet body to the second sheet body roll by the joining roll is surely performed while avoiding the starting end portion of the sheet body forming the second sheet body roll. Also, by accurately detecting the peripheral speed of the second sheet body roll, the sheet body can be reliably joined to the second sheet body roll, and the continuous operation of these sheet bodies can be achieved. Smooth unrolling, and
It is possible to provide a sheet body unwinding device that can be reliably performed.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a sheet body unwinding device according to the present invention.

FIG. 2 is a side view showing a state in which a sheet body unrolled and conveyed from a first sheet body roll is pressed against a second sheet body roll in the sheet body unwinding device.

FIG. 3 is a view showing a second embodiment having a small diameter in the sheet body unwinding device.
FIG. 4 is a side view showing a state in which the sheet roll of FIG.

FIG. 4 is a side view showing another example of the configuration of the sheet body unwinding device according to the present invention.

5 is a side view showing a state in which the sheet body rolls are synchronously rotated in the sheet body unwinding device shown in FIG.

6 is a side view showing a state when the sheet bodies of the respective sheet body rolls are joined in the sheet body unwinding device shown in FIG.

7 is a side view showing a state in which the joining of the sheet bodies of the respective sheet body rolls has been completed in the sheet body unwinding device shown in FIG.

[Explanation of symbols]

 6 1st sheet body roll 8 2nd sheet body roll 9 1st sheet body 10 2nd sheet body 18 Roll diameter measurement sensor 19 Rotary encoder 21 Joining part 22 Joining part sensor 25 Joining roll 30 Sequencer 31 Non-contact speed Sensor 33 Sensor arm

Claims (2)

[Claims] 1. A first rotation operation means for rotating and operating a first sheet body roll, and a rotation speed of the first sheet body roll is controlled via the first rotation operation means, and Of the second sheet body roll, first speed control means for controlling the conveying speed of the sheet body unwound from the sheet body roll, second rotation operation means for rotationally operating the second sheet body roll, By controlling the speed detecting means for detecting the peripheral speed and the second rotating operation means, the peripheral speed of the second sheet roll detected by the speed detecting means is wound around the first sheet roll. Second speed control means for synchronizing the conveying speed of the ejected sheet body, and joint portion detection means for detecting a joint portion provided on the peripheral surface of the second sheet roll, and rotatably supported. And the second sheet body It is possible to move in the direction of contact and separation with respect to
Of a sheet roll unwound from the sheet roll, the joining roll for pressing the peripheral surface of the second sheet roll, and a control means for controlling the moving operation with respect to the joining roll, the control means, The moving operation of the joining roll is controlled based on the detection results by the speed detecting means and the joining portion detecting means, and the second sheet is provided near the end of the sheet body unwound from the first sheet body roll. A sheet body that is pressed against the above-mentioned joining portion on the peripheral surface of the body roll from a position separated by 180 ° around the axis of the second sheet body roll to the joining portion. Unwinding device. 2. The sheet body unwinding device according to claim 1, wherein the means for detecting the peripheral speed of the second sheet body roll is a non-contact speed sensor.